引入热页追踪与提升子系统pghot · v8

We want isolation of misplaced folios to work in contexts where VMA isn’t available, typically when performing migrations from a kernel thread context. In order to prepare for that, allow migrate_misp

From: Gregory Price gourry@gourry.net Tiered memory systems often require migrating multiple folios at once. Currently, migrate_misplaced_folio() handles only one folio per call, which is inefficie

pghot is a subsystem that collects memory access information from multiple sources, classifies hot pages resident in lower-tier memory, and promotes them to faster tiers. It stores per-PFN hotness met

Default pghot stores hotness in a 1‑byte record per PFN, limiting frequency to 2 bits, time to a 5‑bit bucket, and preventing storage of per‑PFN toptier NID. This restricts time granularity and forces

Currently hot page promotion (NUMA_BALANCING_MEMORY_TIERING mode of NUMA Balancing) does hot page detection (via hint faults), hot page classification and eventual promotion, all by itself and sits wi

Subsequent patch adds IBS Memory Profiler driver that is independent of the perf subsystem but needs the CPUID 0x8000001B capability bits. Hence move those bit definitions out of asm/perf_event.h into

Use IBS (Instruction Based Sampling) Memory Profiler feature present in AMD Zen6 processors for memory access tracking. The access information obtained from IBS Memory Profiler is fed to pghot sub-sys

Expose runtime tunables for IBS Memory profiler and arm the profiler. /ibs-mprof/l3miss-only - IbsMemL3MissOnly filter /ibs-mprof/period - op sample period (IbsMemMaxCnt) <de